<?php
session_start();
$id = $_GET['id'];
$name = $_GET['name'];
$price = $GET['price'];
$upd = $_GET['upd'];
if ($upd == "add") {
	if (empty($_SESSION['cart'])) {
		$order = array();
		$order_item = array('id' => $id,'name' => $name,'price' =>$price,'num' =>1);
		array_push($order,$order_item);
		$_SESSION['cart'] = $order;
	} else {
		$order = $_SESSION['cart'];
		if (in_array($id,array_column($order,'id'))) {
			$key = array_search($id,array_column($order,'id'));
			$order[$key]['num'] +=1;
		} else {
			$order_item = array('id' => $id,'name' => $name,'price' =>$price,'num' =>1);
			array_push($order,$order_item);
		}
		$_SESSION['cart'] = $order;
	}
	header('Location:index.php');
}
if ($upd == "cart") {
	if (!empty($_SESSION['cart'])){
	header('Location:cart.php');
} else {
	header('Location:index.php');
}
}
?>